A) 20 s
B) 15 s
C) 17 s
D) 18 s
Correct Answer: A
Solution :
[a] To cross the telephone pole the train has to move a distance equal to its length, i.e., 300 m Now, speed of train \[=54\times \frac{5}{18}\text{m/s}=15\text{m/s}\] \[\therefore \]Time taken to cover the distance \[=\frac{\text{Distance}\,\text{travelled}}{\text{Speed}}\] \[=\frac{300}{15}=20\,\text{s}\] |
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